Deniz-Week3-JS3

week-3/Homework/mandatory/1-practice/2-code-reading.md

@@ -1,63 +1,75 @@
-# Code reading
-
-## Question 1
-
-Take a look at the following code:
-
-```
-1    let x = 1;
-2    {
-3        let x = 2;
-4        console.log(x);
-5    }
-6    console.log(x);
-```
-
-Explain why line 4 and line 6 output different numbers.
-
-## Question 2
-
-Take a look at the following code:
-
-```
-let x = 10
-
-function f1()
-{
-    console.log(x)
-    let y = 20
-}
-
-console.log(f1())
-console.log(y)
-```
-
-What will be the output of this code. Explain your answer in 50 words or less.
-
-## Question 3
-
-Take a look at the following code:
-
-```
-const x = 9;
-
-function f1(val) {
-  val = val + 1;
-  return val;
-}
-
-f1(x);
-console.log(x);
-
-const y = { x: 9 };
-
-function f2(val) {
-  val.x = val.x + 1;
-  return val;
-}
-
-f2(y);
-console.log(y);
-```
-
-What will be the output of this code. Explain your answer in 50 words or less.
+# Code reading
+
+## Question 1
+
+Take a look at the following code:
+
+```
+1    let x = 1;
+2    {
+3        let x = 2;
+4        console.log(x);
+5    }
+6    console.log(x);
+```
+
+Explain why line 4 and line 6 output different numbers.
+Big block and variable will shadow previous value
+
+## Question 2
+
+Take a look at the following code:
+
+```
+let x = 10
+
+function f1()
+{
+    console.log(x)
+    let y = 20
+}
+
+console.log(f1())
+console.log(y)
+```
+
+What will be the output of this code. Explain your answer in 50 words or less.
+//innerscope can acces global scope . we can access x
+// let y inside in the function. and console log outside function we can not access y
+
+## Question 3
+
+Take a look at the following code:
+
+```
+const x = 9;
+
+function f1(val) {
+  val = val + 1;
+  return val;
+}
+
+f1(x);
+console.log(x);
+
+const y = { x: 9 };
+
+function f2(val) {
+  val.x = val.x + 1;
+  return val;
+}
+
+f2(y);
+console.log(y);
+
+
+function is not changing the value ===> 9
+objects are reference type inside f2 function we are modifying a property of object ===> {x:10}
+
+
+
+
+
+
+What will be the output of this code. Explain your answer in 50 words or less.
+```

week-3/Homework/mandatory/2-exercises/exercise-1/exercise-1.js

@@ -1,11 +1,13 @@
 const personOne = {
-    name: 'Popeye',
-    age: 34,
-    favouriteFood: 'Spinach'
-}
+  name: "Popeye",
+  age: 34,
+  favouriteFood: "Spinach",
+};
 
-function introduceYourself(___________________________) {
-    console.log (`Hello, my name is ${name}. I am ${age} years old and my favourite food is ${favouriteFood}.`); 
+function introduceYourself({ name, age, favouriteFood }) {
+  console.log(
+    `Hello, my name is ${name}. I am ${age} years old and my favourite food is ${favouriteFood}.`
+  );
 }
 
-introduceYourself(personOne);
+introduceYourself(personOne);

week-3/Homework/mandatory/2-exercises/exercise-2/exercise-2.js

@@ -1,11 +1,78 @@
 let hogwarts = [
-    { firstName: "Harry", lastName: "Potter", house: "Gryffindor", pet: "Owl", occupation: "Student" },
-    { firstName: "Hermione", lastName: "Granger", house: "Gryffindor", pet: "Cat", occupation: "Student" },
-    { firstName: "Draco", lastName: "Malfoy", house: "Slytherin", pet: null, occupation: "Student" },
-    { firstName: "Cedric", lastName: "Diggory", house: "HufflePuff", pet: null, occupation: "Student" },
-    { firstName: "Severus", lastName: "Snape", house: "Slytherin", pet: null, occupation: "Teacher" },
-    { firstName: "Filius", lastName: "Flitwick", house: "Ravenclaw", pet: null, occupation: "Teacher" },
-    { firstName: "Pomona", lastName: "Sprout", house: "Hufflepuff", pet: null, occupation: "Teacher" },
-    { firstName: "Minerva", lastName: "McGonagall", house: "Gryffindor", pet: null, occupation: "Teacher" },
-    { firstName: "Albus", lastName: "Dumbledore", house: "Gryffindor", pet: "Phoenix", occupation: "Teacher" }
-]
+  {
+    firstName: "Harry",
+    lastName: "Potter",
+    house: "Gryffindor",
+    pet: "Owl",
+    occupation: "Student",
+  },
+  {
+    firstName: "Hermione",
+    lastName: "Granger",
+    house: "Gryffindor",
+    pet: "Cat",
+    occupation: "Student",
+  },
+  {
+    firstName: "Draco",
+    lastName: "Malfoy",
+    house: "Slytherin",
+    pet: null,
+    occupation: "Student",
+  },
+  {
+    firstName: "Cedric",
+    lastName: "Diggory",
+    house: "HufflePuff",
+    pet: null,
+    occupation: "Student",
+  },
+  {
+    firstName: "Severus",
+    lastName: "Snape",
+    house: "Slytherin",
+    pet: null,
+    occupation: "Teacher",
+  },
+  {
+    firstName: "Filius",
+    lastName: "Flitwick",
+    house: "Ravenclaw",
+    pet: null,
+    occupation: "Teacher",
+  },
+  {
+    firstName: "Pomona",
+    lastName: "Sprout",
+    house: "Hufflepuff",
+    pet: null,
+    occupation: "Teacher",
+  },
+  {
+    firstName: "Minerva",
+    lastName: "McGonagall",
+    house: "Gryffindor",
+    pet: null,
+    occupation: "Teacher",
+  },
+  {
+    firstName: "Albus",
+    lastName: "Dumbledore",
+    house: "Gryffindor",
+    pet: "Phoenix",
+    occupation: "Teacher",
+  },
+];
+
+hogwarts.forEach((student) => {
+  let { house, firstName, lastName } = student;
+  if (house === "Gryffindor") {
+    console.log(firstName, lastName);
+  }
+});
+hogwarts.forEach((person) => {
+  let { firstName, lastName, occupation, pet } = person;
+  if (occupation === "Teacher" && pet !== null) {
+    console.log(firstName, lastName);
+  }
+});

week-3/Homework/mandatory/2-exercises/exercise-3/exercise-3.js

@@ -1,9 +1,31 @@
- let order = [
-     { itemName: "Hot cakes", quantity: 1, unitPrice: 2.29},
-     { itemName: "Apple Pie", quantity: 2, unitPrice: 1.39},
-     { itemName: "Egg McMuffin", quantity: 1, unitPrice: 2.80},
-     { itemName: "Sausage McMuffin", quantity: 1, unitPrice: 3.00},
-     { itemName: "Hot Coffee", quantity: 2, unitPrice: 1.00},
-     { itemName: "Hash Brown", quantity: 4, unitPrice: 0.40}
- ]
-
+let order = [
+  { itemName: "Hot cakes", quantity: 1, unitPrice: 2.29 },
+  { itemName: "Apple Pie", quantity: 2, unitPrice: 1.39 },
+  { itemName: "Egg McMuffin", quantity: 1, unitPrice: 2.8 },
+  { itemName: "Sausage McMuffin", quantity: 1, unitPrice: 3.0 },
+  { itemName: "Hot Coffee", quantity: 2, unitPrice: 1.0 },
+  { itemName: "Hash Brown", quantity: 4, unitPrice: 0.4 },
+];
+function findTotal([...rest]) {
+  let plus = 0;
+
+  for (let i = 0; i < rest.length; i++) {
+    plus += rest[i].unitPrice * rest[i].quantity;
+  }
+
+  console.log("QTY \t\t\t  ITEM \t\t\t\t TOTAL");
+
+  for (i = 0; i < rest.length; i++) {
+    console.log(
+      rest[i].quantity +
+        "\t\t\t" +
+        rest[i].itemName +
+        "\t\t\t" +
+        (rest[i].unitPrice * rest[i].quantity).toFixed(2)
+    );
+  }
+
+  console.log("\nTotal: " + plus);
+}
+
+findTotal(order);